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Learn a Fact: 1 x 4

1
8
x  1
2
1
x  5
3
6
x  1
4
0
x  8
5
0
x  3
6
7
x  1
7
1
x  0
8
1
x  9
9
2
x  0
10
0
x  7
11
1
x  1
12
6
x  0
13
3
x  1
14
2
x  1
15
1
x  4
16
0
x  4
17
0
x  5
18
0
x  9

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